发明授权
US5850174A Vehicle security system upgrade 失效
车辆安全系统升级

Vehicle security system upgrade
摘要:
An upgrade method and apparatus for both remote and key-operated two-step vehicle security systems is disclosed. The upgrade blocks attempts to disarm the alarm circuit when the vehicle is armed and unlocked improperly. The upgrade can be added to existing systems regardless of the polarity of the signals used therein. Improved power-up and remote control features can also be added as a part of the upgrade.
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